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I was wondering how you all fee about the open airbox lid/high flow air filter combination in conjunction with with a full exhaust system. I have a rapidbike evo fitted so fueling shouldn’t be an issue. With the airbox modification, have you noticed a power/performance gain? Let me know! Thanks!!
 

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I can’t say I noticed much if anything but I’d also have to admit that I didn’t set myself any before and after comparisons. That’s possibly also an issue with the Evo - you won’t immediately get the full fuelling adjustment so the impact may phase in.
 

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I don't have an exhaust, however I did collect some data. From my understanding there's only a few exhaust that actually make measurable power on the duke anyways.

I have a K&N filter and open air box lid with a power commander V.

First of all, the stock tune is deadly lean so its good that you have a fuel computer. Once I added everything and did an idle relearn I noticed a difference in power. I've also raced a 2nd gen RC390 with my 1st gen duke and it was faster in pretty much every aspect. From my understanding, air box volume is key. There are a few people running the K&N filter upside down and gaining a tiny bit of power as well. Of course none of it matters unless proper fueling is being made.
 

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I read about this before because once I also bought a K&N air filter which had to raise my car power but at last it did nothing and at last I simply wasted my money after that I decide to replace it with something new and searching through the internet and reading a post on damagecontrol-911.com I found out about the ozone generators which work much better than the standard air filters and I know that they have some nuances which make you always take care of them but for me, it's not very important and it's more logical to buy a strong filter and take care of it then always to replace a weak one.
 
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